Summary timeline

Page 1 of 3 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Summary Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Remarks Sum GMT Milestone Entry Event No. GMT Day 32 APU 2 Start 1 13:10:39 TIG-5 OMS TIG 2 13:15:30 TIG OMS End of Burn 3 13:18:08 APU 1 Start 4 13:31:25 EI-13 APU 3 Start 5 13:31:29 Entry Interface (400,000 ft) Mach 24.57 6 13:44:09 EI MSID ------ 32:13:50:00 -----7 7.3 7.35 7.4 7.5 13:50:53 13:51:19 / 13:52:49 13:51:46 13:52:05 13:52:17 Approx Vehicle Ground Location: 39.0 N / -129.2 W Start of Peak Heating Determined by analysis ------ 32:13:51:00 -----Remote sensors indicate off-nominal external event Inertial Beta goes and stays Negative until LOS L2L, L3L, and R2R jet firings occurred near event. n/a V90H2249C n/a ------ 32:13:52:00 -----First clear indication of off-nominal aero increments Altitude 236,800 ft / Mach 23.6 - Over the Pacific Ocean, approx 300 miles West of California Coastline LMG Brake Line Temps (D, A, C) (3) - start of off nominal trend Delta yawing moment coefficient only (as compared to nominal aero). Derived by analysis. Approx vehicle position when first off-nominal data was seen; Data source: STS-107 GPS Trajectory Data Unusual Temperature Increase 8 8.5 13:52:17 / 52:41 13:52:32/55 Supply H2O Dump Nozzle Temps (A, B) (2) and Vacuum Vent Temp (1) - transient (15 GMT shown indicates initial rise duration. Supply H2O Dump to and 23 seconds, respectively) increase in typical rise rates. Nozzle temps took additional 48 secs to return to nominal temp rise, vacuum vent temps took additional 40 secs to return to nominal rise. Left INBD Elevon Lower Skin Temp (1) - OSL Began trending down 3 secs earlier Start of steady (-) growth in roll moment. Derived by analysis. OSL was preceded by Nominal Temp rise. Data source: STS-107 GPS Trajectory Data V58T1703A V58T1700A V62T0440A V62T0551A V58T1702A V62T0439A 9 10 10.5 11 11.2 deleted 13:52:59 13:53:01 13:53:10 / 36 13:53:26 Approx Veh Grd Location: 38.7 N / -123.5 W V09T1006A n/a V58T0394A V58T0157A V58T0193A V58T0257A ------ 32:13:53:00 -----First clear indication of off-nominal rolling moment increment Hydraulic System Left Outbd / Inbd Elevon Return Line Temps (4) - OSL Altitude 231600 ft / Mach 23.0 - Crossing the California Coastline 11.5 13:53:44 / 54:11 1st reported debris (5) observed leaving the Orbiter just aft of Orbiter envelope (Debris EOC video # EOC2-4-0026, 0056, & 0064. No evidence of jet # 1 thru 5) firings near events. n/a ------ 32:13:54:00 -----12 13 14 deleted 13:54:10 / 55:12 13:54:20 Left Main Gear Brake Line Temp B (1) / Strut Actuator Temp (1) / Sys 3 LMG Brake Sw Vlv Ret Line Temp (FWD) (1) - start of off nominal trend Start of slow aileron trim change; Reversal in trend of derived rolling moment coefficient. Mid Fuselage LT BondLine Temp at x1215 (1) & LH Aft Fus Sidewall Temp at x1410 (1) - start of off nominal trend Flash #1 - Orbiter envelope suddenly brightened (duration 0.3 sec), leaving noticeably luminescent signature in plasma trail; plus Debris # 6 - report of very bright debris observed leaving the Orbiter just aft of the Orbiter envelope. Unusual Temperature Increase GMT is approximate (+/- 10 sec) for aileron. Observed roll moment changed from a negative to positive slope. Derived by analysis. Unusual increase in temperature rise rate EOC video # EOC2-4-0026, 0034, & 0009B. R3R and R2R jet firings occurred near events. Debris events 6 & 14 are visually the biggest, brightest events & therefore may indicate the most significant changes to the Orbiter of the western debris events. V58T1701A V58T0405A V90H1500C V58T0842A 15 15.3 13:54:22 13:54:33.3 / 37 V34T1106A V09T1724A n/a ------ 32:13:55:00 -----15.35 13:55:04 / 55:30 Debris # 7 thru 10 observed leaving the Orbiter just aft of Orbiter envelope. Debris #8 EOC video # EOC2-4-0005, 0017, 0021, 0028, and 0030. No n/a event was followed by momentary brightening of plasma trail. Debris #9 event was evidence of jet firings near events. followed by multiple secondary plasma trails. Remote sensors indicate off-nominal external event GMT is approximate. Preliminary match to debris shedding seen n/a in video #10 (Ivins, UT). No evidence of jet firings near event. 15.4 13:55:30 Page 2 of 3 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Summary Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Remarks Sum GMT Milestone Entry Event No. GMT Day 32 15.45 13:55:36 / 56:13 Debris # 11 thru 15 observed leaving the Orbiter just aft of Orbiter envelope. Debris #12 event was preceded and followed by secondary plasma trails. Debris #13 event was followed by momentary brightening of plasma trail adjacent to debris. Debris #14 event consisted of very bright debris observed leaving the Orbiter. EOC video # EOC2-4-0005, 0017, 0021, 0028, 0030, and 0050. n/a No evidence of jet firings near events. (Nearest jet firings occur at 56:17.) Debris events 6 & 14 are visually the biggest, brightest events & therefore may indicate the most significant changes to the Orbiter of the western debris events. Unusual Temperature Increase MSID 15.5 16 16.5 13:55:41 13:56:03 / 56:24 13:56:16 / 56:53 Mid Fuselage Port (Left) Sill Longeron Temp at X1215 - start of off nominal trend V34T1118A V09T1002A V58T0125A V58T0842A V58T1702A V51P0570A V09T1002A V58T0841A V09T1024A V58T1701A V58T0405A ------ 32:13:56:00 -----Left Lower/Upper Wing Skin Temps - Trending down (2) Indication of potential measurement failures Hyd Sys 1 LMG Uplock Actuator Unlock Line Temp; Sys 3 LMG Brake Sw Vlv Ret Line Significant increase in temp rise rate on all four lines Temp (FWD); LMG Brake Line Temp C; LMG Brake Line Temp B; Sys 3 Left Main Gear Strut Actuator Temp - all show a temp rise rate change. ------ 32:13:57:00 -----16.7 17 18 19 20 20.5 21 22 22.5 23 24 25 25.5 26 27 27.5 28 29 29.3 29.5 30 31 32 32.5 13:57:19 / 24 13:57:28 / 43 deleted 13:57:54 13:58:03 13:58:09 deleted deleted 13:58:16 13:58:32 / 54 deleted 13:58:39 / 48 13:58:40 13:58:56 13:59:06 13:59:23 13:59:30.66 / 30.68 13:59:31 13:59:31.4 / 34.5 13:59:32 deleted deleted deleted 13:59:32 MLG LH Outbd Tire Pressures 1 & 2 - start of small increase in pressures Left Lower/Upper Wing Skin Temps (2) - OSL Sys 2 LH Brake Sw Vlv Return Temp (1) Not seen in previous flights V51P0572A V09T1024A Unusual Temperature Increase ------ 32:13:58:00 -----Start of sharp aileron trim Increase Increase in derived rolling and yawing moment increments GMT is approximate (+/- 10 sec) V90H1500C Substantial increase in observed growth rate of both roll and yaw n/a moment increments. Derived by analysis. LMG Brake Line Temp D - Temp rise rate change MLG LH Inbd / Outbd Tire Pressures (4) - Decay to OSL Significant increase in temp rise rate. V58T1703A V51P0570A V51P0571A V51T0574A V51P0573A V51P0572A V51T0575A MLG LH Inbd/Outbd Wheel Temps (2) - OSL BFS Fault Msg (4) - Tire Pressures - 1st Message BFS Fault Msg (4) - Tire Pressures - Last Message ------ 32:13:59:00 -----Left Main Gear Downlocked Indication - Transferred ON Loss of MCC real-time data to the workstations in the FCR and MER Start of two yaw jets firing (R2R and R3R) Observed elevons deflection at LOS Several events and PASS and BFS FSM messages during this time period all indicate the failure signature of ASA 4 Observed aileron trim at LOS V51X0125E Fired continuously until end of data at 13:59:37.4 V79X2634X Left: -8.11 deg (up) Right: -1.15 deg (up) ASAs responded appropriately. However, signature is indicative V57H0253A of failure of ASA 4. (5 Hz) -2.3 degrees V79X2638X 33 34 35 13:59:32.136 deleted 13:59:35/36 Approx Veh Grd Location: 32.9 N / -99.0 W LOS Altitude ~200700 ft / Mach ~18.1 - Near Dallas TX Approximate Vehicle Ground Location at Loss of Signal based on n/a GMT; Data source: STS-107 GPS Trajectory Data Nominal loss of comm at this GMT (for ~15 sec max based on previous flt data) The event occurred between the two times listed. Aerodynamic forces due to sideslip are now reinforcing aerodynamic asymmetry. Up until this time the flight control had been able to maintain the Bank error around 5 deg. n/a Last valid downlink frame accepted by ODRC - OI / BFS / PASS. Start of reconstructed data. Sideslip on vehicle changes sign. 36 13:59:36 Growth in Bank attitude error Page 3 of 3 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Summary Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Remarks Sum GMT Milestone Entry Event No. GMT Day 32 37 13:59:36.8 Aerojet DAP Requests Third Right Yaw RCS Jet (R4R) This additional jet is required to counteract the increasing aerodynamic moments on the vehicle. Fired continuously until end of data at 13:59:37.4 This additional jet is required to counteract the increasing aerodynamic moments on the vehicle. Fired continuously until end of data at 13:59:37.4 The aileron position is now approx -5.2 deg with approx -2.5 deg of aileron trim. The rate of change of aileron trim had reached the maximum allowed by the flight control system. GMT derived by MER data personnel n/a MSID 38 13:59:37.3 Aerojet DAP Requests Third Right Yaw RCS Jet (R1R) 39 13:59:37.n Last aileron data 40 13:59:37.396 End of 5-second period of reconstructed data End of first 5-seconds of the 32-second period of post-LOS data. Start of approximately 25 seconds of no data available 41 13:59:46.347 / 14:00:01.900* PASS Fault Message annunciation - ROLL REF PASS Fault Message annunciation - L RCS LEAK BFS Fault Message annunciations - L RCS LEAK (2) *Time info corrupted for 14:00:01.900 GMT event. ------ 32:14:00:00 -----42 43 44 14:00:02/06 14:00:02.654 14:00:02.660 Debris A observed leaving the Orbiter - Large debris seen falling away from the Orbiter EOC videos # EOC2-4-0024, EOC2-4-0018 & EOC2-4-0118 envelope. PASS Fault Message annunciation - L RCS LJET Start of last 2-seconds of the 32 second period of post-LOS data. n/a Beginning of 2second period of reconstructed data During this final 2 second period of reconstructed data, the data indicates the following systems were nominal: APUs were running and WSB cooling was evident. MPS integrity was still evident. Fuel cells were generating power and the PRSD tanks/lines were intact. Comm and navaids systems in the forward fuselage were performing nominally. RSB, Body Flap, main engine, and right wing temps appeared active. ECLSS performance was nominal. During this final 2 second period of reconstructed data, the data indicates the following systems were off-nominal: All three Hyd systems were lost. The left inbd/outbd elevon actuator temps were either OSL or no data exists. Majority of left OMS pod sensors were either OSH or OSL or no data exists. Elevated temps at bottom bondline centerline skin forward and aft of the wheel wells and at the port side structure over left wing were observed. EPDC shows general upward shift in Main Bus amps and downward shift in Main Bus volts. AC3 phase A inverter appeared disconnected from the AC Buss. GNC data suggests vehicle was in an uncommanded attitude and was exhibiting uncontrolled rates. Yaw rate was at the sensor maximum of 20 deg/sec. The flight control mode was in AUTO. (Note that all Nav-derived parameters (e.g., alpha) are suspect due to high rates corrupting the IMU state.) 45 14:00:03.470 / 14:00:03.637 BFS Fault Message annunciation - L OMS TK P BFS Fault Message annunciation - SM1 AC VOLTS PASS Fault Message annunciation - L RCS PVT 46 14:00:03.637 PASS Fault Message annunciation - DAP DOWNMODE RHC The s/w process which logs the PASS message runs every 1.92 seconds, so this event could have occurred as early as 14:00:01.717 GMT. However, during the 2 sec period, available vehicle data indicates RHC was in detent and DAP was in AUTO. n/a 47 14:00:04.826 End of 2-second period of reconstructed data Last OI Downlink frame 48 49 50 14:00:17 / 22 14:00:21 / 25 14:00:53 End of Peak Heating Debris B and C observed leaving the Orbiter Vehicle Main Body break-up EOC videos # EOC2-4-0024 & -0118 (for both B and C) EOC videos # EOC2-4-0024, -0018 &-0118 Determined by analysis n/a n/a = Nominal/Expected Event or Performance Page 4 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 1 2 3 4 5 6 7 8 9 10 11 Sum GMT No. GMT Day 32 1 13:10:39 2 3 13:15:30 13:18:08 13:26:09 13:27:12 13:31:25 13:31:29 13:31:57 13:31:59 13:32:01 13:32:29 Milestone TIG-5 TIG Entry Event APU 2 Start - Low Press OMS TIG OMS End of Burn FRCS Dump Start FRCS Dump Complete APU 1 Start - Low Press APU 3 Start - Low Press APU 1 Norm Press APU 2 Norm Press APU 3 Norm Press SSME Engine Stow sequence start Sequence was completed with closure of TVC Iso Vlv 1 at 13:33:30 GMT. Mach 24.40 Mach 24.57 Mach 24.66 Mach 24.66 V90Q8001C Remarks MSID / ID 4 5 EI-13 12 13 14 15 16 17 17.5 18 19 20 20.5 21 21.5 6 13:39:09 13:39:11 13:44:09 13:46:48 13:47:52 deleted 13:49:07 13:49:16 deleted 13:49:32 13:50:30 13:50:53 13:51:19 / 13:52:49 EI Qbar 0.5 psf Qbar 2.0 psf ISELECT = 2 Qbar 10 psf EI-5 (304 PRO) Speedbrake close & Rudder cmded to zero Entry Interface (400,000 Ft) Elevon, BF active Closed-Loop Guidance Roll Jets Deactivated Initial Roll Nominal Rise in Center Line Bond Temp (1) due to Entry Heating Mach 24.57 Mach 24.51 Aft fuselage center bottom bond line Determined by analysis Note: L2L jet firing at 13:51:45.38 / 51.45.62. L3L jet firing at 13:51:45.36 / 41.45.60. R2R/R3R jet firings between 13:52:08 / 52:15 during data loss (firings determined by inj temp). R2R/R3R jet firings between 13:52:24 / 52:32 during data loss (firing determined by inj temps). (RCS data taken from Atlas analysis and plotted data). While the magnitude of the observed Beta is not V90H2249C outside the flight history (41G & 42), the almost linear negative ramp prior to the first roll reversal is not consistent with other flights reviewed. This is consistent with a negative rolling and yawing torque on the vehicle. V90H1044C V09T1702A 7 7.3 1st Entry Heating Indication Start of Peak Heating Remote sensors indicate off-nominal external event - earliest known event 22 7.35 13:51:46 Inertial sideslip angle (Beta) goes and stays Negative until LOS Page 5 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 22.5 Sum GMT No. GMT Day 32 7.4 13:52:05 Milestone Entry Event First clear indication of off-nominal aero increments Remarks Delta yawing moment coefficient only (as compared to nominal aero). Derived by analysis. MSID / ID 23 23.3 23.5 7.5 deleted 13:52:15 13:52:17 24 24.5 24.7 24.8 8 13:52:17 deleted deleted 13:52:32 2nd Entry Heating Nominal Rise in Center Line Bond Temps (2) due to Entry Heating Indication Approx Vehicle Ground Altitude 236,800 ft / Mach 23.6 - Over the Pacific Ocean, approx 300 Location: miles West of California Coastline 39.0 N / -129.2 W LMG Brake Line Temp D - On wheel well inbd sidewall (aft of sw vlvs) Start of off nominal trend Mid Fus Lower "Mid" Skin Temp V34T1110A Mid Fus Bottom Center Bond Line Temp X1214 V34T1112A Approx vehicle position when first off-nominal data was seen; Data source: STS-107 GPS Trajectory Data Initiation of temp rise - off nominal based on rise V58T1703A rate comparison with flight experience. 8.5 Supply H2O dump Nozzle temps A/B show temporary increase in temp High rise rate is bounded by data loss. Increase in V62T0440A rise rate (15 second duration of high rise rate). rise rate not observed on previous flights. GMT V62T0439A shown indicates start of initial rise duration. Reference event seq no. 26.6 for termination of event. 24.9 8.5 13:52:32 Vacuum vent temp shows temporary increase in temp rise rate (23 second duration of high rise rate). High rise rate is bounded by data loss. Increase in V62T0551A rise rate not observed on previous flights. GMT shown indicates start of initial rise duration. Reference event seq no. 26.65 for termination of event. Initiation of temp rise - off nominal based on rise rate comparison with flight experience. V58T1700A 25 25.5 26 26.5 26.6 8 13:52:41 deleted LMG Brake Line Temp A - On strut facing MLG door - start of off nominal trend 8 8.5 13:52:41 deleted 13:52:47 Left Main Gear Brake Line Temp C - Start of off nominal trend Supply H2O dump Nozzle temps A/B return to typical rise rates. Unusual Temp Rise High rise rate is bounded by data loss. GMT shown indicates end of initial rise duration. Temp took additional 48 seconds to return to nominal temp rise (53:35 GMT). High rise rate is bounded by data loss. GMT shown indicates end of initial rise duration. Temp took additional 40 seconds to returns to nominal temp rise (53:35 GMT). Temp trending down V58T1702A V62T0440A V62T0439A 26.65 8.5 13:52:55 Vacuum vent temp returns to typical rise rate. V62T0551A 26.7 27 10 13:52:56 13:52:59 Left INBD Elevon Lower Skin Temp - Start of off nominal trend Left INBD Elevon Lower Skin Temp - OSL V09T1006A V09T1006A Page 6 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 27.2 27.5 Sum GMT No. GMT Day 32 10.5 13:53:01 13:53:02 Milestone Entry Event First clear indication of off-nominal rolling moment increment Hyd Syst 1LH INBD Elevon Actr Ret Ln Temp - start of off nominal trend Hyd Syst 3 LOE Ret LN Temp - start of off nominal trend Hyd Syst 3 LOE Ret LN Temp - OSL Hyd Syst 1LH INBD Elevon Actr Ret Ln Temp - OSL Angle of attack modulation active Altitude 231600 ft / Mach 23.0 - Crossing the California Coastline Remarks Start of steady (-) growth in roll moment, derived by analysis Temp trending down Temp trending down OSL was preceded by Nominal Temp rise OSL was preceded by Nominal Temp rise Data source: STS-107 GPS Trajectory Data n/a V58T0157A V58T0394A V58T0394A V58T0157A V90H0803C MSID / ID 28 29 29.3 29.5 11 11 11.2 13:53:10 13:53:11 13:53:24 13:53:26 Alpha Modulation Approx Veh Grd Location: 38.7 N / -123.5 W 30 30.3 11 13:53:31 / 53:34 13:53:34 / 55:57 3rd Entry Heating Indication Hyd Syst 1 LOE Return Line Temp - OSL Nominal Rise in Center Line Bond Temps (3) due to Entry Heating 30.5 31 31.5 31.7 32 32.1 11 11.5 13:53:34 13:53:36 deleted deleted deleted 13:53:44 / 48 Hyd Sys 2 LIE Return Ln Temp - Start of Off Nominal Trend Hyd Sys 2 LIE Return Ln Temp - OSL OSL was preceded by Nom Temp rise plus data loss 3 sec's prior to event 13:53:34 - V09T1016A (Mid Fus Bot Port BL T X 620); 13:54:00 - V09T1022A (Mid Fus Bot Port BL T X 777); 13:55:57 - V09T1624A (Fwd Fus Lwr Skin Bot CL T) Temp trending down V58T0193A V09T1016A V09T1022A V09T1624A V58T0257A V58T0257A Debris #1 - First report of debris observed leaving the Orbiter Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data). Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data). EOC2-4-0064 EOC2-4-0056 EOC2-4-0064 EOC2-4-0056 32.3 11.5 13:53:46 / 50 Debris #2 - Second report of debris observed leaving the Orbiter 32.5 32.7 11.5 13:53:46 13:53:54 / 58 LMG Brake Line Temp A - On strut facing MLG door - Start of off nominal trend (temp rise rate change) Debris #3 - Third report of debris observed leaving the Orbiter. Event followed by momentary brightening of plasma trail. 32.8 11.5 13:54:00 / 04 Debris #4 - Fourth report of debris observed leaving the Orbiter Temp rise rate change from 1.4 F/min to 5.5 F/min V58T1700A and increasing to LOS Seen just aft of Orbiter envelope. No evidence of Debris: RCS jet firings (ref Atlas data). EOC2-4-0056, 0026 Trail: EOC2-4-0064, 0056 Seen just aft of Orbiter envelope. No evidence of EOC2-4-0056 RCS jet firings (ref Atlas data). EOC2-4-0026 Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data). Temp Increase EOC2-4-0056 EOC2-4-0026 V58T1701A 32.9 11.5 13:54:07 / 11 Debris #5 - Fifth report of debris observed leaving the Orbiter 33 13 13:54:10 LMG Brake Line Temp B - Start of off nominal trend Page 7 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 34 34.5 Sum GMT No. GMT Day 32 13:54:20 14 13:54:20 14 Milestone Entry Event Start of slow aileron trim change Reversal in growth trend of derived roll moment coefficient Remarks MSID / ID GMT is approximate (13:54:20 +/- 10 seconds) V90H1500C Observed moment changed from a negative slope n/a to positive slope. Derived by analysis. Unusual Temp Rise (Rise rate higher than STS109 & 87). Rise rate increased from 1 F/min (typical) to 7.6 F/min. Unusual Temp Rise (Rise rate higher than STS109 & 87). Rise rate increased from 2.7 F/min (typical) to 5.5 F/min. Unusual Temp Rise V34T1106A 35 15 13:54:22 M-FUS LT BL Temp at x1215 - start of off nominal trend (increased rise rate) LH Aft Fus Sidewall Temp at x1410 - start of off nominal trend (increased rise rate) Sys 3 Left Main Gear Strut Actuator Temp - start of off nominal trend Approx Veh Grd Location: 38.3 N / -119.0 W 35.2 15 13:54:22 V09T1724A 35.5 35.7 13 13:54:24 13:54:25 V58T0405A Altitude 227400 ft / Mach 22.5 - Crossing the California / Nevada State Data source: STS-107 GPS Trajectory Data Line 36 36.5 15.3 deleted 13:54:33.3 / 33.9 Flash #1 - Orbiter envelope suddenly brightened (duration 0.3 sec), leaving noticeably luminescent signature in plasma trail Note: R3R and R2R 0.24 sec jet firings occurred at EOC2-4-0026 13:54:33.52 / 33.76 and 13:54:33.54 / 33.78 EOC2-4-0034 respectively (ref: RCS Atlas analysis). EOC2-4-0009B Seen just aft of Orbiter envelope. Also, reference EOC2-4-0026 note in item # 36.5 above. Debris events 6 and 14 EOC2-4-0009B are visually the biggest, brightest events and EOC2-4-0030 therefore may indicate the most significant changes to the Orbiter of the western debris events. 36.6 15.3 13:54:35 / 37 Debris #6 - Very bright debris seen leaving the Orbiter 37 37.5 37.7 deleted deleted 13:54:53 MLG LH Outbd Wheel Temp - start of off nominal trend 2 bit flips up (ref #56.5 when temp starts to trend down) Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data). Temp Increase V51T0574A 37.75 15.35 13:55:04 / 10 Debris #7 - Seventh report of debris observed leaving the Orbiter EOC2-4-0030 37.8 38 39 40 13 13:55:12 deleted deleted 13:55:21 Sys 3 LMG Brake Sw Vlv Ret Line Temp (FWD) - start of off nominal trend V58T0842A Drag 11 fps2 Drag Measurement Incorporation Mach 21.nn Page 8 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 40.1 Sum GMT No. GMT Day 32 15.35 13:55:21 / 27 Milestone Entry Event Remarks MSID / ID Debris: EOC2-40030; trail: EOC24-0005, 0017, 0021, 0028, and 0030 EOC2-4-0030, 0050 Debris #8 - Eighth report of debris observed leaving the Orbiter. Event Seen just aft of Orbiter envelope. No evidence of was followed by momentary brightening of plasma trail. RCS jet firings (ref Atlas data). 40.2 15.35 13:55:25 / 29 Debris #9 - Ninth report of debris observed leaving the Orbiter. Event was followed by multiple secondary plasma trails. Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data). 40.3 15.35 13:55:26 / 30 Debris #10 - Tenth report of debris observed leaving the Orbiter Seen well aft of Orbiter envelope. No evidence of EOC2-4-0005 RCS jet firings (ref Atlas data). 40.4 15.4 13:55:30 Remote sensors indicate off-nominal external event GMT is approximate. Preliminary match to debris shedding seen in video from Ivins, UT (Debris #10). Strong confidence that this is an off-nominal event. No evidence of RCS jet firings (ref Atlas data). 40.5 13:55:32 Approx Veh Grd Location: 37.4 N / -114.1 W Altitude 223400 ft / Mach 21.8 - Crossing the Nevada / Utah State Line Data source: STS-107 GPS Trajectory Data 41 41.5 42 42.3 15.45 15.5 15.45 deleted 13:55:36 / 42 13:55:41 13:55:45 / 49 Debris #11 - Eleventh report of debris observed leaving the Orbiter Mid Fus Port (Left) Sill Longn Temp at x1215 - start of off nominal trend Debris #12 - Twelfth report of debris observed leaving the Orbiter. Event was preceded and followed by secondary plasma trails. Seen well aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data). Unusually high temp rise with respect to STS-87 & 109. Went to 2.6 F/min from 0 F/min. Seen aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data). EOC2-4-0050 V34T1118A EOC2-4-0028, 0050 42.5 13:55:55 Approx Veh Grd Location: 37.0 N / -112.4 W Altitude 222100 ft / Mach 21.5 - Crossing the Utah / Arizona State Line Data source: STS-107 GPS Trajectory Data 42.7 15.45 13:55:55 / 59 Debris #13 - Thirteenth report of debris observed leaving the Orbiter. Seen well aft of Orbiter envelope. No evidence of EOC2-4-0005, Event was followed by momentary brightening of plasma trail adjacent RCS jet firings (ref Atlas data). 0017, 0021 to debris. Page 9 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 42.8 Sum GMT No. GMT Day 32 15.45 13:55:58 / 56:00 Milestone Entry Event Debris #14 - Very bright debris observed leaving the Orbiter. Remarks MSID / ID Seen just aft of Orbiter envelope. Debris events 6 EOC2-4-0005, and 14 are visually the biggest, brightest events 0017, 0021, and therefore may indicate the most significant 0028, 0030 changes to the Orbiter of the western debris events. 43 44 16 13:56:02 13:56:03 Qbar 40 psf Aft RCS Pitch Jets Deactivated Left Lower Wing Skin Temp - start of off nominal trend Temp reading trending down (potential sensor/wire V09T1002A damage) Seen just aft of Orbiter envelope. Nearest jet EOC2-4-0017 firings: R2R jet firing at 032:13:56:17.30 / 56:17.54 for 0.24 seconds, & R3R jet firing at 032:13:56:17.28 / 56:17.52 for 0.24 seconds. 44.2 15.45 13:56:09 / 13 Debris #15 - Fifteenth report of debris observed leaving the Orbiter. 44.5 44.6 44.7 44.8 45 46 46.5 16.5 16.5 16.5 16.5 16 13:56:16 13:56:17 13:56:20 13:56:22 13:56:24 13:56:30 13:56:45 Hyd Sys 1 LMG UpLK Actr Unlk Ln Temp - Temp rise rate change Sys 3 LMG Brake Sw Vlv Ret Line Temp (FWD) - Temp rise rate change LMG Brake Line Temp C - Temp rise rate change LMG Brake Line Temp B - Temp rise rate change Left Upper Wing Skin Temp - start of off nominal trend 1st Roll Reversal Initiation Altitude 219000 ft / Mach 20.9 - Crossing the Arizona / New Mexico State Line Sys 3 Left Main Gear Strut Actuator Temp - Temp rise rate change Roll Reversal #1 1st Roll Reversal Complete IMU Velocity Increase Approx Veh Grd Location: 36.1 N / -109.0 W Temp rise rate change from 0.7 F/min (nominal) to 3.9F/min and increasing to LOS Temp rise rate change from 1.5 F/min to 8.8 F/min (stayed at this rate to LOS) Temp rise rate change from 1.3 F/min to 9.9 F/min (stayed at this rate to LOS) Temp rise rate change from 2.1 F/min to 9.1 F/min increasing to LOS Temp reading trending down (potential sensor/wire damage) Mach 21.13 Data source: STS-107 GPS Trajectory Data V58T0125A V58T0842A V58T1702A V58T1701A V09T1024A V90H1044C 46.7 47 48 16.5 13:56:53 13:56:55 13:56:58 Temp rise rate change from 1.7 F/min to 12.9 F/min (stayed at this rate to LOS) Mach 20.76 Reflects accelerations imparted during roll reversal. Same signature observed on STS-109. Nominal event. Matches nominal aero simulation V58T0405A V90H1044C 49 49.5 13:57:nn deleted Bodyflap deflection up 3 degrees V90H6410C Page 10 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 49.6 49.7 50 51 17 Sum GMT No. GMT Day 32 13:57:19 13:57:24 13:57:28 deleted Milestone Entry Event MLG LH Outbd Tire Pressure 1 - start of off nominal trend MLG LH Outbd Tire Pressure 2 - start of off nominal trend Left Lower Wing Skin Temp - OSL Rationale for deletion: Originally indicated as "Start of Roll trim in elevons". Inserted independently early in the investigation, but is better defined by sequence no. 54. "Roll trim" is better indicated with aileron trim. Remarks Bit flip up - off nominal thru comparison with previous flights Bit flip up - off nominal thru comparison with previous flights MSID / ID V51P0570A V51P0572A V09T1002A 52 53 17 19 13:57:43 13:57:54 Left Upper Wing Skin Temp - OSL Sys 2 LH Brake Switching Vlv Return Temp (AFT) - start of off nominal Temp increase trend Start of "sharp" aileron trim increase Increase in derived rolling and yawing moment increments V09T1024A V58T0841A 54 54.3 20 20.5 13:58:03 13:58:09 54.5 55 55.5 22.5 13:58:16 deleted 13:58:20 LMG Brake Line Temp D - Temp rise rate change Mach 19.79; GMT is approximate (13:58:03+/-10 V90H1500C seconds) Sustantial increase in observed growth rate of both n/a roll and yaw moment increments. Derived by analysis. Temp rise rate change from 0.9 F/min to 11.7 V58T1703A F/min (stayed at this rate to LOS) Data source: STS-107 GPS Trajectory Data Approx Veh Grd Location: 34.2 N / -103.1 W Altitude 209800 ft / Mach 19.5 - Crossing the New Mexico / Texas State Line 56 57 58 58.5 58.7 59 60 61 62 63 23 23 deleted 13:58:32 13:58:32 13:58:32 13:58:32 / 59:22 13:58:36 MLG LH Outbd Tire Pressure 1 - pressure trending down (to OSL) MLG LH Inbd Tire Pressure 1 - pressure trending down (to OSL) MLG LH Outbd Wheel Temp - temperature trending down (to OSL) Sys 2 LH Brake Switching Vlv Return Temp (AFT) - temp rise rate change MLG LH Inbd Wheel Temp - start of temperature trending down (to OSL) MLG LH Outbd Tire Pressure 1 - OSL Trending to OSL following 7 sec LOS (initiation time not exact) - ref #60 Trending to OSL following 7 sec LOS (initiation time not exact) - ref #64 Trending to OSL following 7 sec LOS (initiation time not exact) - ref #62 Temp rise rate change from 2.5 F/min to 40.0 F/min until 13:59:22 (temp peak) - ref #70.5 Start of trend to OSL - ref #66 V51P0570A V51P0571A V51T0574A V58T0841A V51T0575A V51P0570A 23 13:58:38 deleted Rationale for deletion: Moved to seq no. 63.5 after further data review. 25 23 13:58:39 13:58:39 MLG LH Outbd Wheel Temp - OSL MLG LH Outbd Tire Pressure 2 - start of pressure trending down (to OSL) Start of trend to OSL - ref #68 V51T0574A V51P0572A Page 11 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 63.5 Sum GMT No. GMT Day 32 25.5 13:58:40 Milestone Entry Event BFS Fault Msg (4) - Tire Pressures - First Message Remarks 32/13:58:39.94 - SM0 Tire P LOB 32/13:58:41.84 - SM0 Tire P LIB 32/13:58:49.54 - SM0 Tire P LIB 32/13:58:56.26 - SM0 Tire P LOB Press rose ~3.5 psia in 2 sec's V51P0571A V51P0573A V51P0573A V51T0575A V51P0573A V51P0572A MSID / ID 64 65 65.5 66 67 68 69 70 70.3 23 23 25 23 23 26 27 27.5 13:58:40 13:58:41 13:58:43 13:58:48 13:58:48 13:58:54 13:58:56 13:59:06 13:59:23 MLG LH Inbd Tire Pressure 1 - OSL MLG LH Inbd Tire Pressure 2 - start of off nominal trend MLG LH Inbd Tire Pressure 2 - start of pressure trending down MLG LH Inbd Wheel Temp - OSL MLG Inbd Tire Pressure 2 - OSL MLG LH Outbd Tire Pressure 2 - OSL BFS Fault Msg (4) - Tire Pressures - Last Message Left Main Gear Downlocked Indication - Transferred ON Loss of MCC real-time data to the workstations in the FCR and MER Uplock indicated no change V51X0125E 70.5 71 28 13:59:22 13:59:30.66 Sys 2 LH Brake Switching Vlv Return Temp (AFT) - start of sharp downward temperature trend Start of R2R yaw firing Temp trending down until loss of signal - ref #81 V58T0841A Last pulse before LOS (stayed on to end of first 5- V79X2634X sec period of recon data at 032/13:59:37.4 GMT) 72 28 13:59:30.68 Start of R3R yaw firing Last pulse before LOS (stayed on to end of first 5- V79X2638X sec period of recon data at 032/13:59:37.4 GMT) 73 73.1 29 29.3 13:59:31 13:59:31.400 Observed elevons deflection at LOS FCS Channel 4 Aerosurface position measurements start trending towards their null values All FCS Channel 4 Bypass valves close (indicating bypassed) Speedbrake channel 4 OI position measurement indicated successively 19, 20, 24 degrees over last three samples prior to LOS (should be closed / 0º). V90H7505C V90H7555C Indicates worsening failure of transducer excitation V57H0253A via a wiring short conditions (5 Hz) Leading indicator of ASA fail (high-rate data) V58P0915A Left: -8.11 deg (up); Right: -1.15 deg (up) 73.2 73.3 29.3 29.3 13:59:31.478 13:59:31.7 Speedbrake was commanded to "overclose" (-10 V57H0253A degrees), position measurements for Channels 1 (5 Hz) thru 3 were 0 degrees. Secondary delta pressure on Ch 4 went to zero, which indicates that the channel was bypassed. This is real data and the ASAs were responding appropriately. Page 12 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 73.5 74 74.5 75 76 77 78 79 80 81 82 Sum GMT No. GMT Day 32 29.5 13:59:32 13:59:32 13:59:32 13:59:32 13:59:32 13:59:32 13:59:32 13:59:32 13:59:32 13:59:32 13:59:32 Milestone Entry Event Observed aileron trim at LOS M-FUS LT BL Temp at x1215 - LOS LH Aft Fus Sidewall Temp at x1410 - LOS LMG Brake Line Temp A - LOS LMG Brake Line Temp B - LOS LMG Brake Line Temp C - LOS LMG Brake Line Temp D - LOS Left Main Gear Strut Actuator Temp - LOS Hyd Sys 1 LMG Uplk Actr Unlk Ln Temp - LOS Sys 2 LH Brake Sw Vlv Return Temp (AFT) - LOS Sys 3 LMG Brake Sw Vlv Return Line Temp (FWD) - LOS Remarks Trim: -2.3 deg (V96H2045C - V90H1500C) LOS LOS LOS at 172.2 F LOS at 154.2 F LOS at 104.8 F LOS at 88.3 F LOS at 76.3 F LOS at 52.2 F LOS at 62.8 F LOS at 67.3 F V34T1106A V09T1724A V58T1700A V58T1701A V58T1702A V58T1703A V58T0405A V58T0125A V58T0841A V58T0842A MSID / ID 82.7 32.5 31:59:32 Approx Veh Grd Location: 32.9 N / -99.0 W Altitude ~200700 ft / Mach ~18.1 - Near Dallas TX 82.8 29.3 13:59:32.130 FCS Channel 4 fail flags raised (1 Hz) on all aerosurface actuators Approximate Vehicle Ground Location at Loss of Signal based on GMT; Data source: STS-107 GPS Trajectory Data Lagging indicator of ASA position measurement V79X3263X discrepancy V79X3268X V79X3273X V79X3278X V79X3334X V79X3339X 83 33 13:59:32.136 LOS (Loss of Signal) Last valid downlink frame accepted by ODRC - OI / BFS / PASS Upper Right Aft (URA) Quad Antenna was (This time has been referred to as "LOS" thoughout the investigation.) selected by BFS Antennae Manage S/W to Start of reconstructed data communicate with TDRS-W. The pointing angle to TDRS-W was off the Orb tail at -65 degs and trending further into blockage. Prev experience / eng calcs predict probable loss of comm at elevation angles greater than -60 degrees. Loss of comm at this GMT is therefore considered nominal. ASA 4 RPC A&C Trip Indication Lagging indicator of ASA transducer excitation short condition V79X4210E V76X4211E 84 29.3 13:59:32.195 85 29.3 13:59:33.560 BFS Fault Message annunciation (1) - FCS CH 4 TDRS-E Data Page 13 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 85.5 Sum GMT No. GMT Day 32 29.3 13:59:32.598 Milestone Entry Event Left Outboard bypass valve reopens. A force fight between channels 1/2/3 and channel 4 begins, resulting in a difference of up to 0.5 degrees observed between the left outboard and inboard elevons Remarks MSID / ID Indicates a short in bypass valve has grown V58P0865A sufficient to drop below voltage threshold of valve; RPC B is current limiting. 86 29.3 13:59:33.863 PASS Fault Message annunciation (1) - FCS CH 4 TDRS-E Data 87 13:59:33.976 Master Alarm noted. D&C analysis is continuing to determine cause of alarm. Leading indicator of RPC B trip / ASA power down. V58P0865A I.e., indicates opening of all bypass valves (due to RPC B trip removing power) on ASA 4. Force fight goes away since actuators are already at the last commanded position (so channel 4 has no hyd load on the servo asking for position change). Indicates opening of all bypass valves (due to RPC V57P0260A B trip removing power) on ASA 4. Since the V57P0261A speedbrake is at zero but is being commanded to V57P0262A "over-close" position (-10) this results in a force fight between channels 1,2,3 and channel 4. 88 29.3 13:59:34.518 Left Outboard force fight ends, driver currents go to zero. (RPC B trip indication). 89 29.3 13:59:34.561 Speedbrake force fight begins (continues to LOS) 90 35 13:59:35/36 Sideslip on vehicle changes sign. The event occurred between the two times listed. Just prior to initial LOS the magnitude of the negative Sideslip started to decrease and between 59:34 and 59:37 sideslip grew from -.6 to +.8 deg. With this change, the normal roll and yaw moments on the vehicle would change sign. Aerodynamic forces due to sideslip are now reinforcing aerodynamic asymmetry. 91 36 13:59:36 Growth in Bank attitude error Up until this time the flight control had been able to maintain the Bank error around 5 deg. Aerojet DAP drops left wing to compensate for increasing aerodymanic moments, creating a bank attitude error. Page 14 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 92 Sum GMT No. GMT Day 32 37 13:59:36.8 Milestone Entry Event Aerojet DAP Requests Third Right Yaw RCS Jet (R4R) Remarks This additional jet is required to counteract the increasing aerodynamic moments on the vehicle. The RCS jet fired, as expected and stayed on to end of first 5-sec period of recon data at 032/13:59:37.4 GMT. MSID / ID 93 38 13:59:37.3 Aerojet DAP Requests Fourth Right Yaw RCS Jet (R1R) This additional jet is required to counteract the increasing aerodynamic moments on the vehicle. The RCS jet fired, as expected and stayed on to end of first 5-sec period of recon data at 032/13:59:37.4 GMT. The aileron position is now approx -5.2 deg with approx -2.5 deg of aileron trim. The rate of change of aileron trim had reached the maximum allowed by the flight control system. 94 39 13:59:37.n Last aileron data 95 40 13:59:37.396 End of 5 second period End of first 5-seconds of the 32-second period of post-LOS data. Start GMT derived by MER data personnel of reconstructed data of approximately 25 seconds of no data available PASS Fault Message annunciation - ROLL REF Message retrieved from "fault message buffer" received between 14:00:04 and 14:00:05. The ROLL REF message is triggered when Roll command req'd to fly reference profiile falls below 37 degs. Message generation less than 10 secs (5 guidance cycles) after start of 4 yaw jets firing suggests rapid change in Lift to Drag ratio. 96 41 13:59:46.347 97 41 13:59:52.114 PASS Fault Message annunciation - L RCS LEAK Data located in PASS fault message buffer. Data is potentially error prone. Data located in BFS fault message buffer. Data is potentially error prone. Data located in BFS fault message buffer. Data is potentially error prone. *Time info corrupted. EOC2-4-0024 EOC2-4-0018 EOC2-4-0118 98 41 14:00:01.540 BFS Fault Message annunciation - L RCS LEAK 99 41 14:00:01.900* BFS Fault Message annunciation - L RCS LEAK 100 42 14:00:02/06 Debris A observed leaving the Orbiter - Large debris seen falling away from the Orbiter envelope. Page 15 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 101 Sum GMT No. GMT Day 32 43 14:00:02.654 Milestone Entry Event PASS Fault Message annunciation - L RCS LJET Remarks Data is potentially error prone. MSID / ID 102 44 14:00:02.660 Beginning of 2 second Start of last 2-seconds of the 32 second period of post-LOS data. period of reconstructed data GMT derived by MER data personnel. CAUTION: Data from this period is suspect because multiple bit errors were evident in this reconstructed data. Many of the parameters were 1 Hz data and therefore only one data sample was available. Where possible, high rate data and/or corroborating data were used to draw subsystem performance conclusions. However, some of the conclusions drawn below may be in error or misinterpreted. During this final 2 second period of reconstructed data, the data indicates the following systems were nominal: APUs were running and WSB cooling was evident (although potentially overcooling). MPS integrity was still evident. Fuel cells were generating power and the PRSD tanks/lines were intact. Comm and navaids systems in the forward fuselage were performing nominally. RSB, Body Flap, main engine, and right wing temps appeared active. With the exception of an apparent FES shutdown, ECLSS performance was nominal. During this final 2 second period of reconstructed data, the data indicates the following systems were off-nominal: All three Hyd systems were lost (zero pressure/zero rsvr qty's). The left inbd/outbd elevon actuator temps were either OSL or no data exists. WSB's appeared to be overcooling APU lube oil. The FES appeared to have shutdown. Majority of left OMS pod sensors were either OSH or OSL or no data exists. Multiple BFS and PASS fault message annunciations for left pod hardware were found in the buffer. Elevated temps at bottom bondline centerline skin forward and aft of the wheel wells and at the port side structure over left wing were observed. EPDC shows general upward shift in Main Bus amps and downward shift in Main Bus volts. AC3 phase A inverter appeared disconnected from the AC Buss. GNC data suggests vehicle was in an uncommanded attitude and was exhibiting uncontrolled rates. Yaw rate was at the sensor maximum of 20 deg/sec. The flight control mode was in AUTO. (Note that all Nav-derived parameters (e.g., alpha) are suspect due to high rates corrupting the IMU state.) Based on the nominal and off-nominal system performance described above, it appears that the fwd/mid/aft fuselage, right wing, and right pod were still intact. 103 45 14:00:03.470 BFS Fault Message annunciation - L OMS TK P Data located in BFS fault message buffer after acquisition of data. Data is potentially error prone. Occurred after L OMS TK P message. Data is potentially error prone. Data is potentially error prone. 104 105 45 45 14:00:0n.nnn 14:00:03.637 BFS Fault Message annunciation - SM1 AC VOLTS PASS Fault Message annunciation - L RCS PVT Page 16 Integ Time Line Team - REV 14 BASELINE STS-107 Mishap Investigation - Master Time Line -BASELINE- 02/27/2003 6 PM Note: Rev 14 BASELINE corrects typo's, pinpoints last pt that MCC/MER received real-time data, adds new debris data & assoc jet firings, adjusts GMTs for BFS entry messages and adds post LOS data (including GNC). Rev 14 was approved by the OVE Working Group on 2/26/03. Seq No. 106 Sum GMT No. GMT Day 32 46 14:00:03.637 Milestone Entry Event PASS Fault Message annunciation - DAP DNMODE RHC Remarks The software process which logs the PASS message runs every 1.92 seconds, so event could have occurred as early as 14:00:01.717 GMT. The fault message was corroborated by an initialization flag for the aerojet DAP roll stick function. However, during the 2 sec period, available vehicle data indicates RHC was in detent & DAP was in AUTO. MSID / ID 107 47 14:00:04.826 End of 2 second period Last OI Downlink frame of reconstructed data GMT derived by MER data personnel. Last Downlist frame (BFS & PASS) was approx 60 ms earlier. Time is for debris first seen well aft of Orbiter envelope. Time is for debris first seen well aft of Orbiter envelope. EOC2-4-0024 EOC2-4-0118 EOC2-4-0024 EOC2-4-0118 108 48 14:00:17/21 Debris B observed leaving the Orbiter 109 48 14:00:18/22 Debris C observed leaving the Orbiter 110 49 14:00:21/25 Vehicle Main Body break-up Onset of vehicle main body break-up EOC2-4-0024 EOC2-4-0018 EOC2-4-0118 111 50 14:00:53 End of Peak Heating Determined by analysis = Expected/Nominal performance or event nn = data still needed